Image reading apparatus and image forming system

2. The image reading apparatus according to claim 1, wherein the first pressing member and the second pressing member press the transparent member in areas outside a conveyance area in which the recording material is conveyed in the longitudinal direction of the transparent member.

3. The image reading apparatus according to claim 1, wherein, in a case where viewed from the upstream side in the conveyance direction, the protruding portion is formed such that differences between the protruding amount of the protruding portion and the protruding amounts of the first contact portion and the second contact portion are equal to or more than 0.1 mm and equal to or less than 0.2 mm to come into contact with the transparent member in a case where the transparent member bends.

4. The image reading apparatus according to claim 1, wherein, in a case where viewed from the upstream side in the conveyance direction, a top of the protruding portion is disposed at a position lower than a first contact position and a second contact position in the vertical direction, the first contact position being a position at which the first contact portion comes into contact with the contact surface, the second contact position being a position at which the second contact portion comes into contact with the contact surface.

6. The image reading apparatus according to claim 5, wherein the first contact portion, the second contact portion, and the protruding portion are integrally formed with the first wall portion by presswork when the housing is formed from a plate shaped material made of metal.

7. The image reading apparatus according to claim 1, wherein the first pressing member comprises a plate spring comprising a fixed portion fixed to the housing, a pressing portion pressing the transparent member, and an urging portion bent from the fixed portion and urging the pressing portion toward the transparent member.

9. The image reading apparatus according to claim 1, further comprising a change unit abutting on the transparent member at a position of at least one of both ends of the second guide portion in the longitudinal direction of the transparent member and configured to move the second guide portion with respect to the second reading unit by rotation to change a gap formed between the second guide portion and the second reading unit.

10. The image reading apparatus according to claim 9, wherein the change unit is, in a case where viewed from the upstream side in the conveyance direction, abutting on the transparent member at a position between the first pressing member and the second pressing member.

11. The image reading apparatus according to claim 1, wherein the optical reading unit comprises a contact image sensor comprising an LED array and a sensor element, the LED array being disposed along the longitudinal direction of the transparent member and configured to irradiate the light onto the recording material, the sensor element being disposed along the longitudinal direction of the transparent member and configured to receive reflected light from the recording material.